66 lines
1.4 KiB
PHP
66 lines
1.4 KiB
PHP
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<?php
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class DbUpdater {
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private $link;
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private $db_type;
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private $need_version;
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function __construct($link, $db_type, $need_version) {
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$this->link = $link;
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$this->db_type = $db_type;
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$this->need_version = (int) $need_version;
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}
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function getSchemaVersion() {
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$result = db_query($this->link, "SELECT schema_version FROM ttrss_version");
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return (int) db_fetch_result($result, 0, "schema_version");
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}
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function isUpdateRequired() {
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return $this->getSchemaVersion() < $this->need_version;
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}
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function getSchemaLines($version) {
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$filename = "schema/versions/".$this->db_type."/$version.sql";
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if (file_exists($filename)) {
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return explode(";", preg_replace("/[\r\n]/", "", file_get_contents($filename)));
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} else {
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return false;
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}
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}
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function performUpdateTo($version) {
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if ($this->getSchemaVersion() == $version - 1) {
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$lines = $this->getSchemaLines($version);
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if (is_array($lines)) {
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db_query($this->link, "BEGIN");
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foreach ($lines as $line) {
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if (strpos($line, "--") !== 0 && $line) {
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db_query($this->link, $line);
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}
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}
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$db_version = $this->getSchemaVersion();
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if ($db_version == $version) {
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db_query($this->link, "COMMIT");
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return true;
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} else {
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db_query($this->link, "ROLLBACK");
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return false;
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}
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} else {
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return true;
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}
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} else {
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return false;
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}
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}
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} ?>
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